Pump



Patented Oct. 27, 1936 1 UNITED STATES PATENT oF ucE Herbert R. Lafferty, Davenport, Iowa, assignor to Red Jacket Mfg. 00., Davenport, Iowa, a cor- 'in a single operation.

poration of Iowa Application December 29, 1934, Serial No. 759,705

2 Claims. (01. 74-50) This invention relates to improvements in hydraulic' pumps, and more particularly to reciprocating water pumps of the shallow-well type, and has for its principal objects to produce a simple and economical construction for devices of the character described.

In carrying out my invention, I provide an improved form of double acting pump including a crank case and pressure chamber formed integrally with the main frame casting and arranged so the pump cylinder and plunger bearings are in alignment with each other so as to be machined I also provide a novel drive for the plunger, and improvements in valve construction, all of which will appear in greater detail in the following description:

The invention may best be understood by ref.- I

erence to the accompanying drawings, in which Fig. l is a fragmentary side view of a pump in accordance with my invention, with the crank case and pressure chamber shown in section.

Fig. 2 is an enlarged detail section taken generally on line 22 of Fig. 1.

Fig. 3 is a section taken .on line 33 of Fig. 2.

Fig. 4 is a detail section taken on line 4-4 of Fig. 1.

Fig. 5 is a detail perspective view of the plunger drive yoke.

Fig. 6 is an enlarged detail of the valve and valve stem mounting.

Referring now to details of the embodiment of my invention illustrated in the drawings, the main parts of the pump consist of a base l0 having a pump housing H and a crank case l2 cast integrally therewith in horizontally spaced relation,

and also forming a support for a motor l3 suitably mounted above the crank case l2 as shown.

The pump housing H has a cylinder l5 cast integrally therein, and lined with a sleeve IS within which the plunger IT is reciprocably mounted. The housing II is. divided by vertically disposed webs l8 and I9 above the cylinder and merging into a web 20 below said cylinder, so as to form two pressure chambers 2| and 22 communicating respectively with opposite ends of the cylinder I5. The housing II has an aperture 28 at its outer end, closed by a plate 28 Each of the pressure chambers is provided with a set of inlet and outlet valves. In the form shown, the inlet valves 23, 24 are mounted on a horizontal web 25 spaced below the cylinder l5 and forming a partition for an inlet passage 26 suitably communicating with the exterior of the housing ll.

Outlet valves 23 and 24 are mounted on horizontal webs l8* and 19 which form continuations of the vertical webs l8 and i9, respectively, above the cylinder I5, and provide a partition for the .outlet chamber 21 at the top of the housing II. Said outlet chamber has an outlet passage indicated at 21 and suitably communicating with the exterior of the housing. A pressure dome 29 is connected with the outlet chamber 21 in the usual manner.

The inlet and outlet valves are all of the poppet type, each including a circular valve plate 30 preferably having a facing piece 3| of suitable semiyielding material such as moulded rubber, and adapted to close the aperture in valve seat 32 as is best seen in Fig. 6. The valve stem 33 is supported in a novel manner, independently of the valve seat 32, by fixing the end which projects through the valve seat to apin 34 mounted on an adjacent abutment, as for instance, the wall of the cylinder I 5. The opposite end of. said stem has a head 35, with a coil spring 36 engaged between said head and the valve plate 30 so as to maintain the valve normally in closed position against the valve seat. a With the valve construction above described, the

valve stem is supported independent of the valve seat so as to eliminate the usual form of valve seat including webs for supporting said stem directly on said seat, which latter construction restricts the eifective area of the valve aperture. The improved form of valve seat 32 disclosed herein may therefore consist of a plain ring, pressed or otherwise mounted in its supporting partition.

The valves are rendered accessible for inspection and repair by valve plugs 38, 38 threaded in the outer walls of the housing I I over each of. said valves. Said plugs are preferably recessed so as to receive the upper ends of the adjacent valve stem, as shown. It will be especially noted that the two plugs 38, 38 at the bottom of the casing serve as removable traps for sand and dirt, and also as a means of draining the entire pump housing, when desired.

The plunger IT has a plunger rod Il which passes through a packing gland 39 of the usual form at the inner end of the housing ll. Said gland is herein formed as a separate piece pressed or otherwise mounted in the end wall of said housing.

The crank case 12 contains the driving mechanism for converting the rotary motion of the main drive shaft 48 to reciprocating motion of the plunger rod Il The drive shaft is suitably driven by the motor l3, as by the usual belt and pulley drive (not shown). As herein illustrated ed in spaced relation therein.

' end formingpa crank member having a crank pin. Said 48 mounted on the outer face of said disc. crank pin extends into a block 49 slidably mount ed between guides 49*, 49 of a vertically disposed yoke 50 supported on the plunger rod We, as

'I'he block" 49 is also retained in its slot by lateral clearly shown in Figs. 2, 3 and 4. The plunger rod I'l extends through 'a bearing 52 at the inner end of the casing, and has its opposite end guided in a detachable bearing cap 53v at the, 20 opposite or outer end of said casing. With this arrangement, the yoke Ell is held in bearing 'engagement with the inner face of the disc 46 so as to be supported in upright positionthereby with out any additional guiding means in said casing.

engagement with the disc 48. This construction is in effect a simplified form of Scottish yoke,

by'whi'chrotation'of the shaft 40 and disc 46 will produce reciprocation of the plunger rod Il @The crank case l2 ispreferably enclosed and partially filled with oil so that the moving parts may be thoroughly lubricated; In order to assist iii-lubricating the plunger rod bearings 52 and 53? at. the ends of said casing, I provide a pair of "deflector blades 55, 55 extending from opposite sides of the yoke 5!] near the top thereof, said blades being inclined downwardly and away from points adjacent the plane of rotation of the disc 46 and having their outer ends in position to 05pass over oil holes 52 and 53 formed in the inner" sides of the plunger rod bearings 52 and 53-, respectively, when said yoke reaches the end of its stroke in either direction. With thisarrangement, oil will be splashed on the blades55 Lfrom the rotating disk 46 or flow from the top of yoke 50, and drop into the oil holes 52 and 53 from time to time, to lubricate these bearings. For simplicity in construction, the inner bearing 52 is a plain bronze bushing, providing a run- :ning fit for the plunger rod, but it will be understood that said bearing may be provided with a packing gland of the usual form, if desired. A leather washer 56 is mounted on the. plunger rod between the casing l2 and pump housing II, to

.;keep water from being carried along the plunger and into'the casing l2.

With the construction above described, it will now be understood that the pump may be manufactured most economically. The housing I I and crank case l2 are in horizontal alignment with each other so that the cylinder l5 and the bores for the packing gland 39 and plunger bearing 52 may all be machined in a single operation, from either end of the casing. The Scottish yoke device in the casing E2 is of especially simple construction, in which the main drive shaft 40 has bearing support in one side wall only of the casi'n'g' l2, and the yoke 50 has no vertical guide means in said casing, but is held in upright position through its bearing. against the disc 46. The

, parts are all readily accessible for inspection, re-

pair or replacement.

Although I have illustrated and described one particular embodiment of my invention, it will beoun derstood that I do not wish to be limited to the exact construction shown and described,

butsithatt various changes andmodifications may be. made: WlthOllt departing from the spirit and scope of my invention as defined in the appended of said casing, an enlarged yoke fixed on saidplu-nger, a blockguided for reciprocation in said yoke vertically of said plunger, a crank member rotatably supported in: said crank case, and including a crank pinuhaving lateral engagement Withsai'd block: to form' the sole means for maintaining said-yoke'and" block in operative position parallel to the plane of rotation of said crank member, and means: carried by said yoke for directinglubricant from the upper portion of said yoke and feeding'it by gravity to the bearin'g guide. of. said plunger when said yoke approachesothe limit of its stroke.

2: "Irr.a -'pump', an= enclosed crank. case adapted to contain lubricant, a horizontally reciprocating plunger having bearing guides at opposite ends 0t said casing, an eniargedyoke fixed on said plunger, a block guided for reciprocation in said yoke'vertically of'osaid plunger, a disc rotatably supported in said crank case and including a crank pin having: lateral engagement with said block, and a projection carried on the upper portion of said yoke .for directing lubricant laterally and downwardly to feed it by gravity to the adjacent bearing guide of said plunger when said yoke approaches the limit of its stroke.

HERBERT R. LAFFERTY. 

